A) Reboot
Users report, the camera starts to work after a reboot Android-devices. Sometimes you have to restart the gadget several times to achieve the desired result. In any case, it makes sense to try this simple way - switch off and back on your smartphone or tablet.
B) Restart in Safe Mode
Each Android-powered device has a download function in "Safe Mode" feature, that is, you reset the phone and turn it on, activating only the basic applications and a limited number of available options. Safe Mode is great for troubleshooting, since the downloaded applications will be disabled and you will be able to determine whether or not there is a conflict between the various software developers and third-party system software related to the use of cameras.